Question

Answer in detail:
What is a pie-diagram? Construct a pie-diagram from the following data.

Sector	% Contribution to GDP
Primary	32
Secondary	28
Tertiary	40

Answer 1

A Pie Chart or pie diagram is a type of graph that displays data in a circular graph. The pieces of the graph are proportional to the fraction of the whole in each category. In other words, each slice of the pie is relative to the size of that category in the group as a whole.

The central angle $=\frac{componentvalue}{sumofallcomponents}\times {360}^{\circ }$

Total amount$=32+28+40=100$

Hence, the central angle for each activity will be calculated as follows

Sector	$\%$ Contribution to GDP	Central angle
Primary	$32$	$\frac{32}{100}\times {360}^{\circ }={115.2}^{\circ }$
Secondary	$28$	$\frac{28}{100}\times {360}^{\circ }={100.8}^{\circ }$
Tertiary	$40$	$\frac{40}{100}\times {360}^{\circ }={144}^{\circ }$